Grinding-machine



A. E. MAYNARD.

GRINDING MACHINE.

APPLICATION FILED MAY Io, Iszo.

1,397,289 mma Nov. 15, 1921.

INVENTOR A. I-:. MAYNARD .y A2 l ATToRNI-:Ys

'rron or MASSACHUSETTS.

ormoni; COMPANY, or soUrn'Bninei-i, MASSACHUSETTS; A VOLUNTARY ASSrJeIAL` specification@ Leners raient.

Grammars-MACHINE.

Patented Nov. 15,1921.

Application inea May io, 192C; serial no. 380,303;

To all 'Lo/wm t may concern N Be it known that ll, ALBERT E. Maximin), a citizen of the United States, residing at Southbridge, in the county of l/Vorcester and State of Massachusetts, have invented certainnew land useful Improvements in lGrinding-Machines, of which the following is a specification. f

This invention relates to improvements in grinding machines and has particular reference to a novel and improved device for use in connection with machines for the grind- `ing of ophthalmic or similar lenses.`

The principal object of the lpresent Vinvention is the provision of afnovel and improved structure satisfactorily applicable toexistingtypes of lens grinding machines, which will adaptsaidmachinesto properly receive and operatively secure in position tools of types other than those designed for the particular machine. i

A further object of the present invention Vis ythe provision of a device of this character which may be readily adjusted to receive different sizes of toolsand will securely retain the Same in centralposition.

Y A further object of the presentinvention is the provision oran improved clamping or retaining device for lens grinding tools, lens holders or the like, which shall lserve to automatically center the tool to lproperly position the same yto prevent movement thereof i in any direction-and at the same time have the axis, in the case of `a cylinder tool, Lproperly held and holding device.

' Other Objects and advantages of my improved construction should be readily Vapparent by reference to the following specilication taken in connection with the accompanying drawings, and it will be understood that I may make any modiications in the specific details of construction shown and described within the scope of the appended claims without departing from or exceeding the spirit of my invention.

Figure I represents a Side elevation of a 'structure embodying my improvements.

Fig. IT represents a top plan view thereof.

Fig. III represents a similar view with the tool removed.

Fig. IV represents a longitudinal sectional view taken as on the line IV-IV of Fig. TIT.

disposed with respect to the F igf. Yrepresents bottom'plan view of" the grinding tool. l i

Fig. VT represents varperspective View of theclampoperatingwrench. i y i N In the drawings, the numeral l Adesignates standing guide flanges 4 which serve as rests l for the under side' of the lens holder or grinding member 5, and at the same time provide guide ways between which slidefthe protecting plates of the adjustable end clamp blocks 7. These'clamp blocks have the studsleeves Ssliding in recesses 9 in the table portion 3, said sleeves threaded to receive the right and left hand adjusting or clampk screw 10 which is threaded into said sleeves and passes through the central portion of the tioning plate 11 secured to the upper .face of the table has a depending yoke 12 fitting within a groove 13 in the adjusting screw-10, serving to hold this member against longi- `being internally` table 3. A posii tudinal i movement within the table while permitting of its free rotation to shift the 16, and tapers toward both ends. This plate Y is adapted to iit within the supposedly rectangular soclretl milled or otherwise suitably formed in the under face of the member 5, and it is on this account vided with the pieces tapering toward the end. This is due to the fact that the. recess is not always exactly correctly positioned in the tool so that were the plate of sizeto substantially fit the tool ,socket 17 there might be possibility oi" the tool being held in slightly twisted position.. With my improved taper shape, however, the width at the point 16 is substantially the width of the groove or socket 17 so ythat the tool is properly positioned lengthwise and is absolutely held against anyaccidental lengthwise movement while the clamp blocks? are brought that itis proi employed.

' terminal clamps y ting within the socket 9 of the table portion,

inward toward yeach other simultaneously,

and as their jaw portions 18 engage the tool 5 adjacent its corners-theyV serve to automatically positionthe-tool accordingv to its side faces rockingrit if 'need be about the points 16 to effect the desired transverse shifting thereof. To facilitate most secure retaining of the tool in vposition the jaws 18 are slightly under-cutso that they engage at the upper edge'first. tending 'to draw the block downward in engagement with the base portion rather than t0 press it upward therefrom as mightbe the case were straight face jaws In connection with the construction of my improved device I would call particular attentionto the plate portions 6 overlying the joint between the main table portion and the and also to the sleeve 8 fitin that these partscombined provide an eX,- tremely tight and satisfactory joint preventing entry of excess of abrasive or "the like liable to cause undue'wear of the parts, insuring the parts at all times operating easily and freelyand securely holding the parts in desired adjusted position, and reducing to a minimum the liabilityof' said parts to either I beoomestuck or unduly, worn on account of the combination with a excess of abrasive thereto. Y

. To rotate the screw 10 and move the jaws into or out of clamping position I preferably the screw slots 2O adaptflattened `web 19 of the wrench member 21 Vhaving a handle 22 for rotating. It will thus be seen that the wrench maybe inserted ateither end of the tool to securelyV tighten the jawsor to release them, as desired, and may be easily withdrawn to beoutof the way while the device is in operation'.

I claim: Y Y Y `1. In a device 'of the character described, tablep'ortion having a central positioning plate tapering toward Vthe ends offa pair -of slidable end members carried by the table and ,Y rection of the Vends of the central positioning member, said end members each being pro-Y vided with aVV pair of clamp jaws located respectively on opposite' sides of the line of,

the: central positioning said central positioning member whereby member will serve lens tool while the taperedY formationwill permit of the clamp j awi twisting` it about the guide member to insure proper Apositioning of the tool as ren spects the table member;

2. A device of the character described, comprising a table Vportion having a central positioning` member to control the lateral positioning of" a pair of clamp portions each provided with spaced clamping jawsand means for shifting the clamping jaws toward or away from disposed in the dil lens :block and having aV a lens tool about the lined central positionw ing member. v Y v 8. A device oflthe characterl described, comprising a table" portion having a transverse Aaperture formed therethrough anda pair of clamp 'members each having a guide sleeve portion engaged in the aperture, supplemental interlocking guides between the clamp members and table portion for preventing relative twistingV movement thereof, and a single means engaging both of the sleeve Amembers for simultaneously shifting them toward or away from each other as desired. Y

4. Thev combination with a tool having a socket in the under face thereof, ofa holder for the tool having a tableportion provided with a positioning member centrally of the same width as the socket and terminally of less width than the width of the socket andk clampmembers carried by the table for enin position.` l

5. An attachment for la grinding machine comprising a table having a depending `attachment stud and an upwardly projecting positioning plate, a-pair of clamping plates carried b Vthe table and terminating in Vupwardly projecting clamping jaws, means for simultaneously shifting the jaws intoVo-r out of operative position, and means on the positioning plate vfor preventingmovement of lboth jaws in the same direction. y V' i f 6. In a device of the character described, the combinationwith a table portion, of` a guideplate thereon, a rightand left hand adjusting screw journaled in the table, means on theguide plateengaging the screw for preventing longitudinal movement thereof, and clamp-jaws carried by the table and veach having a portion engaged by the adjusting screw whereby the clamp jaws are simultaneously vadjusted ltoward or away from each other by rotating movement of the screw. Y Y

7; A device of the character described, comprising a table portion having aV transverse aperture Vformed therethrough and a pair of clamp members each having a guide ysleeve portion engaged in the aperture, supplemental interlocking guides between the clamp members'and vtable portion for preventing relative ,twisting movement thereof, and a single means engaging both of the sleeve members for simultaneously shifting them towardfor away from each other as desired, said means including a right and left hand screw having a foentralperipheral groove, engaged in the groove for preventing longitudinal shifting movement of the screw.

8. A device Vof the character described,

and meansV carried by the table 4and comprising a table portion having a transverse aperture formed therethrough and a pair of clamp members each having a guide sleeve portion engaged in the aperture, supplemental interlocking guides between the clamp members and table portion for preventing relative twisting movement thereof, and a single means engaging both of the sleeve members for simultaneously shifting them toward or away from each other as desired, said means including a right and left hand screw having a central peripheral groove, and means carried by the table and engaged in the groove for preventing longitudinal shifting movement of the screw, said means having a plate portion resting on and secured t0 the upper face of the table member to form a lens tool centering guide.

In testimony whereof l have alixed my signature, in presence of two witnesses.

ALBERT E. MAYNARD.

Witnesses:

ALICE G. HASKELL, ESTHER M. LAFLER, 

